Journal Article

Generalized glycogen storage and cardiomegaly in a knockout mouse model of Pompe disease

Agnes G.A. Bijvoet, Esther H.M. van de Kamp, Marian A. Kroos, Jia-Huan Ding, Bing Z. Yang, Pim Visser, Cathy E. Bakker, Martin Ph. Verbeet, Ben A. Oostra, Arnold J.J. Reuser and Ans T. van der Ploeg

in Human Molecular Genetics

Volume 7, issue 1, pages 53-62
Published in print January 1998 | ISSN: 0964-6906
Published online January 1998 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/7.1.53
Generalized glycogen storage and cardiomegaly in a knockout mouse model of Pompe disease

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Glycogen storage disease type II (GSDII; Pompe disease), caused by inherited deficiency of acid α-glucosidase, is a lysosomal disorder affecting heart and skeletal muscles. A mouse model of this disease was obtained by targeted disruption of the murine acid α-glucosidase gene (Gaa) in embryonic stem cells. Homozygous knockout mice (Gaa -/-) lack Gaa mRNA and have a virtually complete acid α-glucosidase deficiency. Glycogen-containing lysosomes are detected soon after birth in liver, heart and skeletal muscle cells. By 13 weeks of age, large focal deposits of glycogen have formed. Vacuolar spaces stain positive for acid phosphatase as a sign of lysosomal pathology. Both male and female knockout mice are fertile and can be intercrossed to produce progeny. The first born knockout mice are at present 9 months old. Overt clinical symptoms are still absent, but the heart is typically enlarged and the electrocardiogram is abnormal. The mouse model will help greatly to understand the pathogenic mechanism of GSDII and is a valuable instrument to explore the efficacy of different therapeutic interventions.

Journal Article.  4693 words.  Illustrated.

Subjects: Genetics and Genomics

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